Patent GB-306449-A (GB)
Title: Improvements in axial threshing or threshing and straw-reducing machines
IPC: A01F7/06
Filed: 1929-01-24
Abstract: 306,449. Schlayer, F. Feb. 20, 1928, [Convention date]. Thrashing machines ; straw, softening. - In a thrashing or thrashing and straw-reducing machine, of the type wherein the material to -be thrashed passes longitudinally of the beater drum 4, the material is fed into the drum through an inlet 14 and is seized by the rotary beaters 3 that thrash it against stationary abutmens 5, the abutments and the beaters being positioned closer to each other towards the far end of the drum. The material falls through the sieve-like bottom portion of the drum and from the bottom opening of a hood 13 at the end of the drum in streams that have different characteristics according to the zones of the drum from which they fall and that vary from practically pure grain below the first part of the drum to almost entirely short straw at the far end. The streams under the beater portions of the drum fall on to a preliminary winnowing-mechanism consisting of two transversely-arranged oppositely moved shaking boxes 21 suspended in front by springs and at the rear carried by reciprocating levels that derive their motion from a blower shaft 16. The range of movement of the boxes may be varied. Ledges 21<1> may be provided on the winnowing device to keep the grain &c. in separate streams. A control device is arranged in the blower mouthpiece 24 to adjust the quantity of air directed through each of the two boxes. A second similar winnowing-mechanism 27, arranged behind or below the hood 13 at the end of the beater drums is also provided with a blower 18. The winnowed grain falls down floors to an elevator 26 which carries it either to a drum 29 that acts as an awning device or to a conveyer 29<1> that takes it directly to a cleaning device 30. The cleaner comprises a single shaking box, movable transversely of the machine, through which an air blast is directed by a blower 31. The cleaned grain escapes through an outlet 33, and any grain or short straw that may be blown off the cleaner falls through a hopper on to the upper box of the winnowing-apparatus 27. The feed to the beater drum is controlled by a regulator comprising a box 37 having a slowly-running roller 40 provided with obliquely-placed vanes 41 mounted at its front end. A grate-like table 42 with a step-like continuation 43 extending into the drum is arranged behind the roller. A rapidly running endless belt 49 arranged on the cover of the box 37 is fitted with fingers 50. Material adhering to the fingers is stripped by a swingable rake 58 that carries it to the inlet of the thrashing drum. The axle of the rake is provided with a handle 60 that is normally fixed but which, on being released, permits the rake to drop to the dotted line position in which entrance of material to the drum is prevented. A centrifugal governor 62 stops the automatic feed when the number of revolutions of the thrashing-machine diminishes too much. The vane roller may be taken out when thrashing tangled grain. The sheaves are fed to the automatic feed by an endless belt elevator 44 having an upper roller 46 that can be arranged in any one of three distinct positions in its bearing according to the amount of stemming of the material desired.